Hi rawr.moasaur,
In my opinion, the best way to delete stuff is from the
qwerty keyboard. So open your
LG Voyager and use it.
To delete "My Sounds", launch the Media Center and select: 1. Music & Tones > 5. My Sounds. Then select a sound with the up/down navigation buttons and press "Erase" (the left soft key).
To delete "My Ringtones", launch the Media Center and select: 1. Music & Tones > 3. My Ringtones. Then select a ringtone with the up/down navigation buttons and press "Options" (the right soft key) and select "1. Erase" from the Options menu. Note that you can only erase ringtones that you have added. The built-in ringtones cannot be deleted---that's why the Options menu is not available for them.
Best regards, WiredNot